This part of GB/T 14235 specifies the test methods for usability properties such as bending strength, surface hardness, thermal stability and wetting angle of investment - binder.
This part is applicable to the determination of the usability properties such as bending strength, surface hardness, thermal stability and wetting angle of investment - binder.
2 Terms and definitions
For the purposes of this document, the following term and definition apply.
2.1
bending strength at ambient temperature of low temperature pattern wax materials
strength of the load obtained from static bending to brittle fracture at a certain loading speed
3 Testing of bending strength
3.1 Overview of testing method for bending strength at ambient temperature
The prepared paste or liquid pattern wax materials is pressed into a strength specimen with a specified dimension. After the specimen is placed at a certain temperature for 24 h, the load peak value of the static bending brittle fracture is tested by a flexural properties tester, and the bending strength of the specimen is calculated with the mechanical formula.
3.2 Instruments and apparatus
Instruments for bending strength testing:
—— Flexural property tester: see Figure.1 for the specimen holder installed on the flexural property tester, with a fulcrum spacing of 30 mm.
—— Mercury-in-glass thermometer: the temperature measuring range is 0 ℃ to 200 ℃ with an accuracy of 1 ℃.
—— Surface thermometer: the temperature measuring range is 0 ℃ to 100 ℃ with an accuracy of 1 ℃.
GB/T 14235.2-2018 The following standards are cited：
GB/T 14235.2-2018 Cited by the following standards：
